package thinkInJava.chap15TypeParam;

/**
 * @description:
 * @author: Lisp
 * @time: 2020/9/21 11:15
 */
public class LinkedStack<T> {
    private class Node {
        T item;
        Node next;

        Node() {
            item = null;
            next = null;
        }

        Node(T item, Node next) {
            this.item = item;
            this.next = next;
        }

        boolean end() {
            return item == null && next == null;
        }
    }

    private Node top = new Node();

    public void push(T item) {
        top = new Node(item, top);
    }

    public T pop() {
        T result = top.item;
        //判断是不是最后一个结点
        if (!top.end()) {
            top = top.next;
        }
        return result;
    }

//    public static void main(String[] args) {
//        LinkedStack<String> lss = new LinkedStack<>();
//        for (String s : "Phasers on stun!".split(" ")) {
//            lss.push(s);
//        }
//        String s;
//        while ((s = lss.pop()) != null) {
//            System.out.println(s);
//        }
//    }
}
